12816655 has 4 divisors (see below), whose sum is σ = 15379992. Its totient is φ = 10253320.

The previous prime is 12816607. The next prime is 12816667. The reversal of 12816655 is 55661821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55661821 = 733 ⋅75937.

It is not a de Polignac number, because 12816655 - 2⁹ = 12816143 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12816655.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1281661 + ... + 1281670.

It is an arithmetic number, because the mean of its divisors is an integer number (3844998).

Almost surely, 2^12816655 is an apocalyptic number.

12816655 is a deficient number, since it is larger than the sum of its proper divisors (2563337).

12816655 is an equidigital number, since it uses as much as digits as its factorization.

12816655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563336.

The product of its digits is 14400, while the sum is 34.

The square root of 12816655 is about 3580.0356143480. The cubic root of 12816655 is about 234.0228324082.

The spelling of 12816655 in words is "twelve million, eight hundred sixteen thousand, six hundred fifty-five".